Woodworking tool of chromium steel containing cobalt

ABSTRACT

A HIGH-SPEED WOODWORKING TOOL CONSISTING OF A STEEL ALLOY OF SUBSTANTIALLY THE FOLLOWING COMPOSTIONS IN PERCENT BY WEIGHT; CARBON 1.5-20, SILICON 0.20-0.40, MANGANESE 0.20-0.40, CHROMIUM 12.0-13.0, MOLYBDENUM 0.40-0.60, VANADIUM 0.40-0.60, TUNGSTEN 1.50-2.50, COBALT 2.503.50, AND THE REMAINDER SUBSTANTIALLY OF IRON.

United States Patent M 3,554,735 WOODWORKING TOOL OF CHROMIUM STEEL CONTAINING COBALT Heinrich Hiltebrand, Bassersdorf, Zurich, Switzerland, as-

Signor to ALBA-Werkzeugfabrik Lennartz & Co., Bulach, Zurich, Switzerland No Drawing. Filed Nov. 19, 1968, Ser. No. 777,177 Int. Cl. C22c 39/14 US. Cl. 75-126 1 Claim ABSTRACT OF THE DISCLOSURE A high-speed woodworking tool consisting of a steel alloy of substantially the following composition in percent by weight: carbon 1.5-2.0, silicon 0.20-0.40, manganese 0.20-0.40, chromium 12.0-13.0, molybdenum (1.40-0.60, vanadium 0.400.60, tungsten 1.50-2.50, cobalt 2.50- 3.50, and the remainder substantially of iron.

The quality of Woodworking tools nowadays must satisfy very severe conditions. The cutting speeds have been greatly increased, so that the temperature of the cutting edges of the tools become higher, and besides increased heat-resistance properties, such tools must have a long edge-time and improved wear resisting qualities.

Only tools made of high-speed steel can satisfy these severe requirements, however such tools require a heat treatment at about 1200 C. and demand rigorous requirements to the technique of hardening or tempering.

Particularly planing knives which may have current lengths up to 1300 millimeters require particularly expensive hardening plants.

I have now found that a steel alloy of a composition Patented Jan. 12, 1971 requiring considerably lowering hardening temperatures can be used with adv-antage for making woodworking tools. The steel alloy according to the invention comprises the following components in percentage by weight: Carbon 1.5-2.0%, silicon 0.20-0.40%, manganese 0.20- 0.40%, chromium 12.0-13.0%, molybdenum GAO-0.60%, vanadium (MO-0.60%, tungsten 1.5-2.5%, cobalt 2.5- 35%, the remainder being iron. Tools made from the above alloyed steel have a cutting efficiency corresponding to that of tools made from a good quality of high-speed steel; however, for hardening the tools made from this new alloy, they must be brought only to a temperature of from 980 to 1020 (3., this temperature requiring less expensive hardening plants, and less delicate problems of hardening technique are to be solved. Particular advantages are obtained when the described alloy is used for making planing tools or cutters for machining wood and pressboard materials.

What is claimed is:

1. A woodworking tool consisting of a steel alloy having a composition essentially within the following range in percent by weight: carbon 1.5-2.0, silicon 0.20- 0.40, manganese 0.20-0.40, chromium 12.0-13.0, molybdenum 0.40-0.60, vanadium 0.40-0.60, tungsten 1.50- 2.50, cobalt 2.50-3.50 and the remainder substantially iron.

References Cited UNITED STATES PATENTS 2,598,714 6/1952 Nelson 126H 2,983,601 5/1961 Fletcher 75126H 3,114,630 12/1963 Steven 75-126H 3,306,735 2/1967 Nemoto 75-126H HYLAND BIZOT, Primary Examiner 

